orifice
Hole for passage
An orifice is an opening, especially one in the body—the mouth, nostrils, ear canals, and others less mentionable.
The word sounds clinical or deliberately formal, which makes it useful for anatomical contexts and for comic euphemism: Every orifice was examined.
Technical uses describe any hole or aperture through which something passes.
Adjustable optical inlet
- holeAbsence in matter
- gapUnfilled space between
- slitNarrow elongated opening
- punctureHole from penetration
perforation · fissure · slot · vent · inlet · outlet · breach · rupture
Oral opening
- nostrilNasal breathing aperture
- anusPosterior digestive opening
- ear canalPassage to eardrum
- urethraUrinary exit canal
vagina · pupil · pore · sphincter · meatus · stoma · naris · cervix
Tube conveying fluid
- tubeHollow cylindrical passage
- channelPassage for transmission
- passageSegment of text
- pipeHollow conveyance channel
valve · nozzle · spout · funnel · drain · intake · exhaust · flue
aperture
Adjustable optical inlet
puncture · perforation · fissure · slot · vent · inlet · outlet · breach · rupture · crack
mouth
Oral opening
urethra · vagina · pupil · pore · sphincter · meatus · stoma · naris · cervix · blowhole
duct
Tube conveying fluid
pipe · valve · nozzle · spout · funnel · drain · intake · exhaust · flue · vent hole
jet
Forced fluid stream
weir · spillway · outfall · culvert · flume · flow rate · pressure drop · venturi · restrictor · choke
hollow
Empty within
- pocketFabric compartment in clothing
- recessPause in activity
- depressionProlonged low state
pit · socket · fossa · sinus · void · concavity · indentation · crater · dimple · lacuna